The current design codes discuss the effective compressive strengths of columns, which reflect a decrease in load transfer performance that can occur when columns and slabs have different concrete compressive strengths. The effective compressive strength of a column increases as it is confined by the slab, and the design codes mandate three different effective compressive strengths for interior columns (confinement on four sides), exterior columns (confinement on three sides), and corner columns (confinement on two sides). For both corner and exterior columns, the confinement effect of the slab is significantly smaller than that for the interior column, and there is a more marked decrease in load transfer performance. However, there is still a lack of theoretical studies investigating the effective compressive strengths of the corner and exterior columns. Therefore, based on the analysis model established in previous research, this study has proposed an equation for calculating the effective compressive strengths of the corner, exterior and isolated columns without any confinement effects of the slab. In addition, axial loading tests of isolated columns were conducted and the proposed equation was verified.

中文翻译：

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具有介入楼板的柱的简化有效抗压强度

当前的设计规范讨论了柱的有效抗压强度，这反映了当柱和板具有不同的混凝土抗压强度时可能发生的荷载传递性能的下降。柱的有效抗压强度随着它被楼板的限制而增加，设计规范规定了三种不同的有效抗压强度：内柱（四边约束）、外柱（三边约束）和角柱（约束）两侧）。对于角柱和外柱，板坯的约束效应明显小于内柱，荷载传递性能下降更为明显。然而，仍然缺乏研究角柱和外柱有效抗压强度的理论研究。因此，本研究在前人研究建立的分析模型的基础上，提出了计算墙角、外立柱和孤立柱的有效抗压强度的公式，该公式不受楼板约束。此外，还进行了孤立柱的轴向载荷试验，并验证了所提出的方程。